...六个面的点数分别为1、2、3、4、5、6)先后抛两次,将得到的点数分别记...
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发布时间:2024-10-24 06:26
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时间:2024-10-31 04:40
(1) ;(2) ;(3)
试题分析:想列出基本事件;(1)找出满足条件 的基本事件,根据古典概型公式求出概率;(2)根据直线与圆相切,利用圆心到直线的距离等于半径和点到直线距离公式求出 满足的条件,找出满足条件的基本事件,再根据古典概型知识求出满足的概率;(3)列出满足条件的基本事件数,再根据古典概型知识求出满足的概率.
试题解析:(1) 先后 次抛掷一枚骰子,将得到的点数分别记为 ,
事件总数为 .
满足条件 的基本事件有10种 (基本事件略) 2分
满足条件 的概率是 4分
(2)先后 次抛掷一枚骰子,将得到的点数分别记为 ,
事件总数为 .
因为直线 与圆 相切,所以有
即: , 6分
由于 .所以,满足条件的情况只有
或 两种情况.
所以,直线 与圆 相切的概率是 8分
(3)先后 次抛掷一枚骰子,将得到的点数分别记为 ,
事件总数为 因为,三角形的一边长为
所以,当 时, , 种
当 时, , 种
当 时, , 种 11分
当 时, 种
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